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  • Beta Alternator Not Charging

    Beta Alternator not charging when the engine is rev'd a little or a lot.
    It appears to be charging only at idle.
    What could it be?

    Beta 2019, Same as 2016 - 2019 4T.

    Battery volts 12.6.
    When at idle the voltage on multi meter only goes up slowly (12.8v) after 2 minutes
    If the revs go up the voltage drops again to approx what would be in the battery if the engine was off. Let it idle and the volts will slowly increase again.

    Has about 26v ac at the 3 stator wires at idle. ( Only speed I can check)

    Did diode test on Rectifier Regulator and everything checked out perfect.

    Earth appears to be ok

    Anyone know what could be the problem. Or what can I check next.
    1998 KDX200 sold

  • #2
    Originally posted by Jallopy View Post
    Beta Alternator not charging when the engine is rev'd a little or a lot.
    It appears to be charging only at idle.
    What could it be?

    Beta 2019, Same as 2016 - 2019 4T.

    Battery volts 12.6.
    When at idle the voltage on multi meter only goes up slowly (12.8v) after 2 minutes
    If the revs go up the voltage drops again to approx what would be in the battery if the engine was off. Let it idle and the volts will slowly increase again.

    Has about 26v ac at the 3 stator wires at idle. ( Only speed I can check)

    Did diode test on Rectifier Regulator and everything checked out perfect.

    Earth appears to be ok

    Anyone know what could be the problem. Or what can I check next.
    I'd swap the battery first John. make sure its not loading the alternator as the excitation comes up. Is it lead-acid or Li-ion?

    AC idle voltage is ball-park.
    "Mindfulness has no interest in knowing the answers, it exists solely in understanding the questions"

    Comment


    • #3
      Pete, I have swapped batteries . Took it out of my other 2015 Beta 390
      I have 2 li-ion batteries both less than 5 mths old and have run a load test etc and they both pass.

      I cant check the stator ac voltage at faster revs because when I release my thumb of the starter button the engine dies.
      The reg / rec. must power up something to keep the engine running when it is all connected.
      That r/r plug has 3 thick white wires and 1 red and 1 black wire.
      1998 KDX200 sold

      Comment


      • #4
        John, I suggest you physically plug and replug all the connectors, donít rely on just a visual check.
        Itís resolved similar issues on 2 Betas recently.

        Comment


        • #5
          I have re plugged the ones around the fuses, headlight etc but I will remove the tank and have a good look for any faults.

          Im off for my 30 minute push bike ride now, when i get back Ill have another dig to see what the trouble is.

          No kick start on this model, so it is bump start only in the bush if the battery depletes.
          1998 KDX200 sold

          Comment


          • #6
            Originally posted by Jallopy View Post
            I have re plugged the ones around the fuses, headlight etc but I will remove the tank and have a good look for any faults.

            Im off for my 30 minute push bike ride now, when i get back Ill have another dig to see what the trouble is.

            No kick start on this model, so it is bump start only in the bush if the battery depletes.
            Go over all the connectors in the triangular cavity in the main frame under the tank, thats where Ive had some connectors that looked good, but after much tail chasing/swapping components found that there was a connection that wasn't 100% positively engaged.
            As always, we should start with the basics before going off on tangents ^rof

            Comment


            • #7
              Obviously, diagnose & fix the real issue but these little things are great and weigh about 300g.
              Attached Files
              2020 Beta RR300

              Comment


              • #8
                Cameron had the right idea, check all the plugs.

                Removed the tank and the first bullet connector I looked at was not pushed "home" it was tight but still needed another 4mm to go and to get it to go in, it was very very hard.

                Replaced the tank, and the battery charged at idle and reving .

                Hopefully That was the problem. Intermittent faults are a nightmare to find - everything appears to be working then the fault appears again.:speechles

                Earth bullet connector

                Update : This connector is only for the map switch. Nothing to do with the charging system.
                Attached Files
                1998 KDX200 sold

                Comment


                • #9
                  Originally posted by Jallopy View Post
                  Cameron had the right idea, check all the plugs.

                  Removed the tank and the first bullet connector I looked at was not pushed "home" it was tight but still needed another 4mm to go and to get it to go in, it was very very hard.

                  Replaced the tank, and the battery charged at idle and reving .

                  Hopefully That was the problem. Intermittent faults are a nightmare to find - everything appears to be working then the fault appears again.:speechles

                  Earth bullet connector
                  The Beta tech who did the wiring probably had some olive oil left on his hands from smoko and couldn't get a firm grip. I'd check for spaghetti in the air box, I hear it's common:grinning-

                  https://www.youtube.com/watch?v=SxRo3cejh94

                  Comment


                  • #10
                    Originally posted by Jallopy View Post
                    Cameron had the right idea, check all the plugs.

                    Removed the tank and the first bullet connector I looked at was not pushed "home" it was tight but still needed another 4mm to go and to get it to go in, it was very very hard.

                    Replaced the tank, and the battery charged at idle and reving .

                    Hopefully That was the problem. Intermittent faults are a nightmare to find - everything appears to be working then the fault appears again.:speechles

                    Earth bullet connector
                    Good find thanks for the pic.
                    MM

                    Comment


                    • #11
                      Problem is back again, charges slowly at idle but when the revs pick up it stops charging
                      The battery only has about 12.8V after a return from a ride. It is normally over 13 Volts.

                      I will try swapping a borrowed rectifier regulator tomorrow to see if that fixes the issue.

                      Intermittent electrical faults -smi-smi
                      1998 KDX200 sold

                      Comment


                      • #12
                        Just an update. 2019 Beta 390 RR has been at the dealer for 3 weeks and the stator was changed. Although they said the old stator look good.

                        Next couple of rides same problem battery not charging past about 12.5 Volts.

                        Sent this video to the dealer and he said to drop the Beta back in.

                        https://www.youtube.com/watch?v=12d9JUogme8

                        At idle bike appears to charge, as the motor revs up the volts drop Is that normal?

                        Back to the dealer for another 10 days and still could not find a problem.

                        Today I went riding started with a fully charged battery 13.3V
                        After about half an hour of riding I checked the battery and it only had 1 light on.

                        I should explain that the Lithium battery has a test button built in and when the button is held down 1, 2, or 3 lights will illuminate 1 light means charge and voltage below 12.7V 2 lights on is medium about 12.9 v and 3 lights on means ok and volts 13 or more.

                        I swapped my battery with Michael bike as he had his efi 2017 Beta 430.
                        After 15 minutes riding, Michael's battery in my bike had drained back to 1 light. My battery in Michaels bike had charged up to 2 lights on.

                        Next we swapped rectifier/ regulators same result my bike 1 light and Michaels bike the battery now had 3 lights on.

                        Next we swapped over the three diode pack, capacitor, and another diode component.
                        Still my bike would not charge the battery. The voltage was about 12.3v all day. (Still enough to start the bike)
                        Yet Michaels bike with my battery, rec/reg, diodes etc was fully charged.

                        Anyone know what could be wrong?

                        I wonder if the magnets on flywheel are dodgy,or wiring harness or something electrical on the engine is draining to much power as the motor is reved up.
                        1998 KDX200 sold

                        Comment


                        • #13
                          John, Did you check Michaels reg/rec output like your video? That should tell you if the voltage you are seeing is normal. It's possible you have a parasitic drain when running which is draining the battery faster than the alternator can top it up.

                          A KTM over on KTMTalk is experiencing a similar problem.

                          http://ktmtalk.com/showthread.php?54...-Regulator-OK!

                          There might be helpful info in there for you.
                          CRF 100F 2004
                          Beta XT 2020

                          Comment


                          • #14
                            oops double post
                            CRF 100F 2004
                            Beta XT 2020

                            Comment


                            • #15
                              Have you checked the magnets on the rotor are still in the correct spot? I had a Tm450 that drove me mad and it turned out the magnets had shifted. Re glued in the correct place and good to go. Other than that do a voltage drop test from the regulators output to the battery to see if you can pin point which side you are losing voltage on.
                              Current toys, Subaru powered Manxter buggy, 2018 Gasgas Ec300, Mt-09 Tracer 2016,
                              Previous toys, TM En300 2016, 2004 Ec300, 2009 Tenere 660, 1996 Cr250, 1984 Yz100, 2006 FZ6, 1981 Z750, 1981 XL250s.

                              If you could reason with religious people there would be no religious people.. House.

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